When did they stop showing Cartoons on NBC? wasnt Alvin and the Chipmunks on it? on sat mornings, they show TNBC, for teens, i watched it once, and i thought it was pretty boring. Why did they stop showing cartoons?

It was a few seasons after they started showing "Saved by the Bell", which started in 1989. After that became a success, they decided to drop cartoons and focus on teenaged sitcoms. I know that "Wishkid" was one of the last NBC Saturday morning cartoons. My guess would be 1991 or 1992.

I really missed Mr. T

Yeah, 1991 sounds right. The last cartoon season on NBC basically consisted of:

Spacecats
Yo! Yogi!
Wish Kid
Chip & Pepper's Cartoon Madness
Alvin & The Chipmunks go to the movies (I think. This may have been cancelled the season before)
Pro Stars
Saved By the Bell
California Dreams